Evaluation of the effect of two different desensitizing agents on shear bond strength of universal adhesive resin (an invitro study )

Background and Aim: dentin desensitizers may affect dentin organic matrix properties or occlude dentinal tubules which may have adverse effects on the bonding performance of adhesive systems. The aim of this study was invitro evaluation of Gluma desensitizer and Tokuyama Shield Plus effects or shear bond strength of (BISCO) all-bond universal bonding  system. Materials and Methods: 30 caries free extracted human premolars were sectioned horizontally from CEJ and then occlusal surfaces were flattened with standard-grit diamond disk to expose dentin surface. Teeth were randomly divided into 3 groups (control group without use of dentin desensitizers, Gluma desensitizer and Tokuyama Shield Force Plus). Bonding was performed by All-bond universal bonding system (Bisco) on exposed dentin surface and a composite post (2mm height and 0.7mm diameter) was built on every sample. After storing samples for 72 hours in distilled water, universal testing machine was used to measure shear bond strength of samples. Results: Gluma desensitizer group showed significant increase on shear bond strength compared to control (p value= 0.01). there was no significant difference between Tokuyama and control group (p value= 0.995). Conclusion: Gluma increased shear bond strength of resin adhesive but Tokuyama shield force plus did not have Statistically significant effect on it.